390 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



crystallized telluric acid, HoTeOg was the starting point. By careful 

 heating in a glass bulb this compound can be reduced to TeOj, and by 

 heating in hydrogen, to metal. In the latter case finely divided silver was 

 added to prevent volatilization of tellurium. The telluric acid was frac- 

 tionally crystallized, but the different fractions gave fairly constant re- 

 sults. I therefore group Staudenmaier's data so as to bring them into 

 series more suitable for the present discussion: 



Mean, 69.440, it .0024 



Hence Te= 187.16. 



Second.— H,,TeOe to Te. 



H^TeOc. Loss in Weight. Per cent. Te. 



1.2299 .5471 55.517 



1.0175 .4526 55.518 



2.5946 1.1549 55.488 



Mean, 55.508, ± .0068 



Hence Te = 127.31. 



Staudenmaier also gives four reductions of TeOo to Te, in presence of 

 finelv divided silver. The data are as follows: 



Mean. 79.950, ± .0043 



Hence Te = 127.60. 



Chikashige' resorted to Brauner's method, giving the ratio between 

 silver and TeBr^. In all essential particulars the work resembles that 

 of Brauner, except that the tellurium, instead of being extracted from 

 metallic tellurides, was derived from Japanese native sulphur, in which 



ijourn. Chem. Soc, 69, 881. 189G. 



